str_=input()
lst=[]
for i in str_:
    lst.append(i)
def paixu(c):
    a=len(c)
    for i in range(a):
        for i in range(a):
            if i<a-1:
                if ord(c[i].upper())>ord(c[i+1].upper()):
                    c[i],c[i+1]=c[i+1],c[i]
    return c
print(''.join(a for a in paixu(lst)))
